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"This is as an occasional treat rather than regular coffee drinking and a lot of Costa drinks do seem to be aimed at younger people.

"They should be clear with their policy, they either serve under 16s or not, rather than just being at the discretion of particular places. Then people know where they stand.

"If they are concerned about health then perhaps they should they also stop selling cakes or high calorie drinks to overweight children because obesity is a far more serious health issue in this country than caffeine consumption."

Daily Post reports the new rule was introduced this summer.

A Costa spokesman said: "We do not encourage the sale of caffeine to children under 16 and it is at store discretion to question a customer’s age if they have any concerns.